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Numerical treatment of realistic boundary conditions for the eddy current problem in an electrode via Lagrange multipliers

Authors: Alfredo Bermúdez, Rodolfo Rodríguez and Pilar Salgado
Journal: Math. Comp. 74 (2005), 123-151
MSC (2000): Primary 78M10, 65N30
Published electronically: July 20, 2004
MathSciNet review: 2085405
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Abstract: This paper deals with the finite element solution of the eddy current problem in a bounded conducting domain, crossed by an electric current and subject to boundary conditions appropriate from a physical point of view. Two different cases are considered depending on the boundary data: input current density flux or input current intensities. The analysis of the former is an intermediate step for the latter, which is more realistic in actual applications. Weak formulations in terms of the magnetic field are studied, the boundary conditions being imposed by means of appropriate Lagrange multipliers. The resulting mixed formulations are analyzed depending on the regularity of the boundary data. Finite element methods are introduced in each case and error estimates are proved. Finally, some numerical results to assess the effectiveness of the methods are reported.

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Additional Information

Alfredo Bermúdez
Affiliation: Departamento de Matemática Aplicada, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain

Rodolfo Rodríguez
Affiliation: GI$^{2}$MA, Departamento de Ingeniería Matemática, Universidad de Concepción, Casilla 160-C, Concepción, Chile

Pilar Salgado
Affiliation: Departamento de Matemática Aplicada, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain

Keywords: Low-frequency harmonic Maxwell equations, eddy current problems, finite element computational electromagnetism, Lagrange multipliers
Received by editor(s): October 15, 2002
Received by editor(s) in revised form: July 16, 2003
Published electronically: July 20, 2004
Additional Notes: This work was partially supported by Programa de Cooperación Científica con Iberoamérica, Ministerio de Educación y Ciencia, Spain.
The first author was partially supported by Xunta de Galicia grant PGIDT00PXI20701PR (Spain).
The second author was partially supported by FONDAP in Applied Mathematics (Chile).
The third author was partially supported by FEDER-CICYT grant 1FD97.0280 (Spain).
Article copyright: © Copyright 2004 American Mathematical Society

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